Process for producing microcrystalline Co/Ti-substituted barium

Details Process for producing microcrystalline Co/Ti-substituted barium Process for producing microcrystalline Co/Ti-substituted barium

1989-08-01

1990-10-02

Rosenberg, Peter D.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423634, C01G 4906

Patent

active

049605828

ABSTRACT:
A process of producing a spinel structure Ni/Zn ferrite-modified, Co/Ti-substituted microcrystalline barium ferrite platelets having an average particle size of 0.03-0.15 .mu.m, a temperature coefficient of coercive force of not more than +1 Oe/.degree. C., including small absolute values in negative region, and a saturated magnetization of not less than 56 emu/g, which comprises: forming substantially amorphous preecursors of Co/Ti-substituted barium ferrites; adding an aqueous solution of nickel salts to the dispersion of the precursors of Co/Ti-substituted barium ferrites, and subjecting the slurry to hydrothermal reaction, thereby to provide precursors of spinel structure nickel ferrite-modified, Co/Ti-substituted barium ferrites; depositing a water insoluble zinc compound on the precursors; and calcining the precursors in the presence of barium chloride, washing the calcined products to remove therefrom the barium chloride, and drying.

REFERENCES:
patent: 4404254 (1983-09-01), Franz
patent: 4865834 (1989-09-01), Tanihara

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